128 lines
4.4 KiB
C#
128 lines
4.4 KiB
C#
//-----------------------------------------------------------------------
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//-----------------------------------------------------------------------
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// file="ExpSource.cs"
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// Project: StgSharp
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// AuthorGroup: Nitload Space
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// Copyright (c) Nitload Space. All rights reserved.
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//
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// Permission is hereby granted, free of charge, to any person
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// obtaining a copy of this software and associated documentation
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// files (the “Software”), to deal in the Software without restriction,
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// including without limitation the rights to use, copy, modify, merge,
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// publish, distribute, sublicense, and/or sell copies of the Software,
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// and to permit persons to whom the Software is furnished to do so,
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// subject to the following conditions:
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//
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// The above copyright notice and
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// this permission notice shall be included in all copies
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// or substantial portions of the Software.
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//
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// THE SOFTWARE IS PROVIDED “AS IS”,
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// WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED,
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// INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
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// IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,
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// DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
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// ARISING FROM, OUT OF OR IN CONNECTION WITH
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// THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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//
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//-----------------------------------------------------------------------
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//-----------------------------------------------------------------------
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using System;
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using System.Collections.Generic;
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using System.IO;
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using System.IO.MemoryMappedFiles;
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using System.Text;
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using System.Threading;
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namespace StgSharp.Script.Express
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{
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public class ExpFileSource : IDisposable, IScriptSourceProvider
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{
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private bool disposedValue;
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private FileStream _expFileStream;
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private int _location;
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private MemoryMappedFile _expMemoryMappedFile;
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private MemoryMappedViewStream _expMemoryMappedStream;
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private SemaphoreSlim readLineSemaphore = new SemaphoreSlim( 1, 1 );
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private StreamReader _memoryReader;
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public ExpFileSource( string path )
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{
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if ( !File.Exists( path ) ) {
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throw new FileNotFoundException();
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}
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_expFileStream = new FileStream(
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path, FileMode.Open, FileAccess.Read );
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_expMemoryMappedFile = MemoryMappedFile.CreateFromFile(
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_expFileStream, null, 0, MemoryMappedFileAccess.Read,
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HandleInheritability.None, true );
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_expMemoryMappedStream = _expMemoryMappedFile.CreateViewStream(
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offset: 0, size: 0, access: MemoryMappedFileAccess.Read );
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_memoryReader = new StreamReader( _expMemoryMappedStream );
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}
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public bool IsEmpty => _memoryReader.EndOfStream;
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public int Location => _location;
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// ~ExpFileSource()
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// {
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// Dispose(disposing: false);
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// }
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public void Dispose()
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{
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Dispose( disposing: true );
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GC.SuppressFinalize( this );
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}
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public void EndWriting()
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{
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}
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public string ReadLine()
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{
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readLineSemaphore.Wait();
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string line = _memoryReader.ReadLine()!;
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_location++;
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readLineSemaphore.Release();
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return line;
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}
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public string ReadLine(out int position)
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{
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throw new NotImplementedException();
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}
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public void ResetToBegin()
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{
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readLineSemaphore.Wait();
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_expMemoryMappedStream.Seek( 0, SeekOrigin.Begin );
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_location = 0;
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readLineSemaphore.Release();
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}
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IScriptSourceProvider IScriptSourceProvider.Slice(int location, int count)
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{
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throw new NotSupportedException();
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}
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protected virtual void Dispose( bool disposing )
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{
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if( !disposedValue ) {
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if( disposing ) {
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_expFileStream.Dispose();
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_expMemoryMappedFile.Dispose();
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_expMemoryMappedStream.Dispose();
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_memoryReader.Dispose();
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}
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disposedValue = true;
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}
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}
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}
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}
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